Use latest Python for stubtest in CI (#10641)

tests/stubtest_allowlists/darwin-py312.txt

@@ -28,3 +28,6 @@ xxlimited.Xxo.x_exports
 (locale.dgettext)?
 (locale.gettext)?
 (locale.textdomain)?
+
+# should be removable once 3.12.0rc2 is released:
+posix.lseek

tests/stubtest_allowlists/linux-py312.txt

@@ -44,3 +44,6 @@ tty.__all__
 tty.cfmakecbreak
 tty.cfmakeraw
 xxlimited.Xxo.x_exports
+
+# should be removable once 3.12.0rc2 is released:
+posix.lseek

tests/stubtest_allowlists/py310.txt

@@ -160,3 +160,5 @@ asynchat.async_chat.use_encoding
 asynchat.find_prefix_at_end
 pkgutil.ImpImporter\..*
 pkgutil.ImpLoader\..*
+
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime

tests/stubtest_allowlists/py312.txt

@@ -173,3 +173,7 @@ typing\._SpecialForm.*
 typing\.NamedTuple
 typing\.LiteralString
 typing\.Annotated
+
+# These two should be removable after 3.12rc2 is released:
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime
+os.lseek  # a pos-only parameter name changed in py311/py312

tests/stubtest_allowlists/py38.txt

@@ -158,3 +158,5 @@ asynchat.async_chat.use_encoding
 asynchat.find_prefix_at_end
 pkgutil.ImpImporter\..*
 pkgutil.ImpLoader\..*
+
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime

tests/stubtest_allowlists/py39.txt

@@ -149,3 +149,5 @@ asynchat.async_chat.use_encoding
 asynchat.find_prefix_at_end
 pkgutil.ImpImporter\..*
 pkgutil.ImpLoader\..*
+
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime

tests/stubtest_allowlists/py3_common.txt

@@ -659,5 +659,3 @@ typing(_extensions)?\.IO\.__iter__  # See https://github.com/python/typeshed/com
 
 # Omit internal _KEEP argument
 tarfile.TarInfo.replace
-
-types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime